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Ion selective separator for lithium sulfur secondary battery as well as preparation method and application method thereof

A lithium-sulfur secondary battery, ion-selective technology, applied to battery components, circuits, electrical components, etc., can solve problems such as unsatisfactory stability or capacity characteristics, to improve the overall electrochemical performance, promote Practical use, effect of inhibiting migration of polysulfides

Active Publication Date: 2013-12-25
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although the generation and diffusion of polysulfides can be partially avoided through the positive electrode pore structure and polymer compounding, its stability or capacity characteristics are still not satisfactory. If the structure of the lithium-sulfur battery itself can be used to develop a barrier Polysulfide ions passing through the functional separator will greatly improve the cycle stability of the battery, thereby further promoting the development of lithium-sulfur secondary batteries

Method used

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  • Ion selective separator for lithium sulfur secondary battery as well as preparation method and application method thereof
  • Ion selective separator for lithium sulfur secondary battery as well as preparation method and application method thereof

Examples

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Effect test

Embodiment 1

[0019] A cation exchange membrane material with a thickness of 5 microns and a sulfonic acid group is prepared by a spin-coating method, and at the same time, it is combined with a polyethylene diaphragm to form a composite diaphragm by hot pressing. The composite diaphragm is used as a lithium-sulfur secondary battery diaphragm, and simultaneously realizes electronic insulation and cation selective permeability, so that lithium ions migrate smoothly in the system, while polysulfide anions are confined to the positive electrode side. At the same time, the sulfur-activated carbon composite material (wherein the mass fraction of sulfur is 50%) is used as the positive electrode, the metal lithium sheet is used as the negative electrode, and the lithium bis(trifluoromethylsulfonyl)imide (its concentration in both solutions is 1mol / L) of 1,3-dioxane and 1,2-dimethoxyethane solution (the volume ratio of the two solutions is 1:1) is used as the electrolyte to make a lithium-sulfur se...

Embodiment 2

[0021] The material is polyamide, polyvinyl alcohol, polysulfone (the mass fractions are 30%, 30%, 40%) prepared by lamination, and the nanofiltration membrane with a thickness of 600 microns is made into a diaphragm material and used alone Diaphragm material, nanofiltration membrane pore size is 5 nanometers. The separator is used as a lithium-sulfur secondary battery separator, and simultaneously realizes electronic insulation and cation selective permeability, so that lithium ions migrate smoothly in the system, while polysulfide anions are partially confined on the positive electrode side. At the same time, the sulfur-carbon black composite material in the foamed aluminum network (the mass fraction of sulfur is 50%) is used as the positive electrode, the metal lithium sheet is used as the negative electrode, and tetraethylammonium tetrafluoroborate (the concentration of which in the two solutions is 0.5mol / L) of 1,3-dioxane and 1,2-dimethoxyethane solution (the volume rati...

Embodiment 3

[0023] A cation exchange membrane with a thickness of 10 microns and a carboxylic acid group is formed on the surface of the polypropylene porous membrane by dipping the membrane, and is used as a diaphragm material alone. The separator is used as a lithium-sulfur secondary battery separator, and simultaneously realizes electronic insulation and cation selective permeability, so that lithium ions migrate smoothly in the system, while polysulfide anions are confined to the positive electrode side. At the same time, the sulfur-mesoporous carbon composite material (wherein the mass fraction of sulfur is 67%) is used as the positive electrode, the metal lithium sheet is used as the negative electrode, and the lithium bis(trifluoromethylsulfonyl)imide (its concentration in the two solutions is the same) 0.5 mol / L), lithium nitrate (0.25 mol / L) in ethylene glycol dimethyl ether solution as the electrolyte to make lithium-sulfur secondary batteries. At a charge-discharge rate of 1.5C...

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Abstract

The invention belongs to the technical field of ion selective separators, and in particular relates to an ion selective separator for a lithium sulfur secondary battery, and a preparation method and an application method of the ion selective separator. According to the ion selective separator provided by the invention, the separator of the lithium sulfur battery is made from an ion selective material or a compound structure of the ion selective material, and the shortcomings of quite low charging and discharging efficiency and quite poor battery performance stability caused by the dispersion of polysulfide of an original lithium sulfur battery between the anode and the cathode are conquered. As the selective transmission of the lithium cation is allowed to transmit and the transmission of the polysulfide anion is blocked in an electrolyte system of the lithium sulfur battery, the whole electrochemical performance of the battery system is improved. Targeted at that the original separator system only provides the single type function of electron insulation between the anode and the cathode, the ion selective separator provided by the invention can simultaneously achieve the two functions of electron insulation and ion selective transmission and has the potential to provide a new solution scheme for the technical obstacles of polysulfide migration inhibition and the like of the lithium sulfur battery, and the practicability of the sulfur in the lithium sulfur secondary battery can be promoted with a high-capacity anode material used in combination.

Description

technical field [0001] The invention belongs to the technical field of ion-selective diaphragms, and in particular relates to an ion-selective diaphragm for lithium-sulfur secondary batteries and a preparation and application method thereof. Background technique [0002] The development of the modern electronics industry has continuously improved the performance of portable devices, and has also put forward higher and higher requirements for battery energy density; on the other hand, batteries for electric vehicles also have extremely high requirements for batteries with high specific energy. The performance of existing lithium-ion batteries cannot meet the requirements of these devices gradually, and it is imperative to develop new high-energy battery systems. [0003] Sulfur is a positive electrode material with high theoretical specific capacity, the theoretical capacity can reach 1672mAh / g, and the theoretical energy density of the battery composed of lithium negative el...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/403H01M50/409H01M50/449
CPCY02E60/10
Inventor 黄佳琦张强彭翃杰魏飞
Owner TSINGHUA UNIV
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